package com.MutiModule.common.kindeditor.servlet;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Hashtable;
import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.simple.JSONObject;

import com.MutiModule.common.kindeditor.Comparator.NameComparator;
import com.MutiModule.common.kindeditor.Comparator.SizeComparator;
import com.MutiModule.common.kindeditor.Comparator.TypeComparator;
import com.MutiModule.common.utils.CookieUtilss;
import com.MutiModule.common.utils.StringUtilss;

public class FileManagerServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		
		//根目录路径，可以指定绝对路径，比如 /var/www/attached/
		String rootPath = req.getServletContext().getRealPath("/") + "uploadFiles" + File.separator;
		
		//根目录URL，可以指定绝对路径，比如 http://www.yoursite.com/attached/
		String rootUrl  = req.getContextPath() + File.separator + "uploadFiles" + File.separator;
		
		// 20150717	alexgaoyh	servlet上传时，增加文件路径部分的限定 	文件空间功能处理	begin
		String contextPath = req.getParameter("contextPath");
		String detailpath = req.getParameter("detailPath");
		if(StringUtilss.isNotEmpty(contextPath)) {
			rootPath = rootPath + contextPath + File.separator;
			rootUrl = rootUrl + contextPath + File.separator;
		}
		if(StringUtilss.isNotEmpty(detailpath)) {
			rootPath = rootPath + detailpath + File.separator;
			rootUrl = rootUrl + detailpath + File.separator;
		}
		// 20150717	alexgaoyh	servlet上传时，增加文件路径部分的限定 	文件空间功能处理	end
		
		//图片扩展名
		String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};

		String dirName = req.getParameter("dir");
		if (dirName != null) {
			if(!Arrays.<String>asList(new String[]{"image", "flash", "media", "file"}).contains(dirName)){
				resp.getWriter().println("Invalid Directory name.");
				return;
			}
			rootPath += dirName + "/";
			rootUrl += dirName + "/";
			File saveDirFile = new File(rootPath);
			if (!saveDirFile.exists()) {
				saveDirFile.mkdirs();
			}
		}
		//根据path参数，设置各路径和URL
		String path = req.getParameter("path") != null ? req.getParameter("path") : "";
		String currentPath = rootPath + path;
		String currentUrl = rootUrl + path;
		String currentDirPath = path;
		String moveupDirPath = "";
		if (!"".equals(path)) {
			String str = currentDirPath.substring(0, currentDirPath.length() - 1);
			moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
		}

		//排序形式，name or size or type
		String order = req.getParameter("order") != null ? req.getParameter("order").toLowerCase() : "name";

		//不允许使用..移动到上一级目录
		if (path.indexOf("..") >= 0) {
			resp.getWriter().println("Access is not allowed.");
			return;
		}
		//最后一个字符不是/
		if (!"".equals(path) && !path.endsWith("/")) {
			resp.getWriter().println("Parameter is not valid.");
			return;
		}
		//目录不存在或不是目录
		File currentPathFile = new File(currentPath);
		if(!currentPathFile.isDirectory()){
			resp.getWriter().println("Directory does not exist.");
			return;
		}

		//遍历目录取的文件信息
		List<Hashtable> fileList = new ArrayList<Hashtable>();
		if(currentPathFile.listFiles() != null) {
			for (File file : currentPathFile.listFiles()) {
				Hashtable<String, Object> hash = new Hashtable<String, Object>();
				String fileName = file.getName();
				if(file.isDirectory()) {
					hash.put("is_dir", true);
					hash.put("has_file", (file.listFiles() != null));
					hash.put("filesize", 0L);
					hash.put("is_photo", false);
					hash.put("filetype", "");
				} else if(file.isFile()){
					String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
					hash.put("is_dir", false);
					hash.put("has_file", false);
					hash.put("filesize", file.length());
					hash.put("is_photo", Arrays.<String>asList(fileTypes).contains(fileExt));
					hash.put("filetype", fileExt);
				}
				hash.put("filename", fileName);
				hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
				fileList.add(hash);
			}
		}

		if ("size".equals(order)) {
			Collections.sort(fileList, new SizeComparator());
		} else if ("type".equals(order)) {
			Collections.sort(fileList, new TypeComparator());
		} else {
			Collections.sort(fileList, new NameComparator());
		}
		JSONObject result = new JSONObject();
		result.put("moveup_dir_path", moveupDirPath);
		result.put("current_dir_path", currentDirPath);
		result.put("current_url", currentUrl);
		result.put("total_count", fileList.size());
		result.put("file_list", fileList);

		resp.setContentType("application/json; charset=UTF-8");
		resp.getWriter().println(result.toJSONString());
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doGet(req, resp);
	}
}
